怎样从文件读bmp图？

Question

   FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER 
                        ¦FORMAT_MESSAGE_FROM_SYSTEM ¦ 
                        FORMAT_MESSAGE_IGNORE_INSERTS,  
                        NULL,  GetLastError(),
                        MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                        (LPTSTR) &Buf, 0,    NULL );
    MessageBox(hWnd,(LPCTSTR)Buf,"Error Message",0);就是出错信息啊